Purair Advanced Series Ductless Fume Hood (P40), 96" / 2400mm nominal width. The Purair Advanced Series ductless fume hoods are a series of high efficiency products designed to protect the user and the environment from hazardous vapors generated on the work surface. At the heart of the Purair ductless fume hood product line is the innovative Multiplex Filtration Technology that creates a safe work environment over the widest range of applications in the industry. Purair Advanced ductless fume hoods and chemical processing workstations are available in 7 standard sizes, in metal or polypropylene construction, totaling 14 standard models. They feature: High operator protection to fume and particle hazards. Purair Advanced ducless fume hoods product line is available in seven sizes. High capacity air handling system delivers face velocity of 100 fpm. A low airflow alarm warns of insufficient face velocity